Hello Kiwi Al...
How are things in Taupo ? My parents moved to NZ last November and are finding things rather expensive in Auckland, where both of my sisters, their family and grandchildren live. I'm sure you could commiserate... Perhaps we could chat about your location off line ?
Yes, kroil is not intended to stay on for long term lube. I would worry that its continued use could eventually strip any platings which may be on parts. It is a penetrating oil to free up seized fasteners and get them moving. I use Remoil, and the trigger mechanism can be cleaned with solvent and air to get it residue free and dry. Any light oil, preferably synthetic will do. Some use a high pressure grease, since they feel that the sear may be highly loaded. I would avoid grease due to what might happen to it here in our midwest polar winter weather. It is unfortunate that access to the trigger requires removing the action from the stock, but once the action is properly bedded, the risk of moving the point of impact is reduced when doing this. I would hate to get in the field and find the trigger gritty or sticky...